bytescout barcode reader sdk for .net Determining the Functional Size in Software

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Determining the Functional Size
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Without getting into the specifics of how the IFPUG 43 method rates a specific base functional component as Low, Average, or High, the following example illustrates the basic steps to arrive at the functional size (in units of function points) for the sample set of functional user requirements previously discussed
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The function point components to be counted based on the preceding include Internal logical file (ILF) Count 1 ILF for the Employee data group because it is a persistent logical entity maintained by the application Based on the function point counting rules, the complexity of this function would be Low (refer to ISO 20926: 2009 for detailed counting rules): 1 Low ILF = 7 FP External interface file (EIF) Count 1 EIF for the externally maintained Security logical entity It is a Low complexity EIF: 1 Low EIF = 5 FP External input process(es) (EI) Count 4 EIs: one EI each for the elementary processes of Add Employee, Update Employee, Terminate Employee, and Merge Duplicate Employee Records Each EI accesses only one FTR (file type referenced) and meets the IFPUG requirements for a Low complexity EI function: 4 Low EI (of 3 FP each) = 12 FP External output process(es) (EO) Count 1 EO for the user to browse an employee s data (which includes the step of using an algorithm to decrypt the date of birth for display) The report accesses 1 FTR and has less than 19 DETs and is therefore a Low complexity EO: 1 Low EO = 4 FP External query process(es) (EQ) Count 2 EQs: 1 for the Weekly Report (listing) and 1 for the User Security Logon function Each of these elementary processes meets the requirements for an EQ Based on the IFPUG 43 rules, they are classified as a Low EQ: 2 Low EQ (of 3 FP each) = 6 FP The total functional size expressed in function points is the sum of the individual components: Functional size = ILF + EIF + EI + EO + EQ = 7 + 5 + 12 + 4 + 6 = 34 FP (IFPUG 43) Figure 19-1 shows the context diagram for the functional user requirements included in this functional size The full details and FP counting procedure are contained in the IFPUG Function Point Counting Practices Manual 43, available through ISO (wwwjtc1-sc7org/) or from the International Function Point Users Group (IFPUG) at wwwifpugorg
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Add Employee (EI) Update Employee (EI) Delete Employee (EI) Merge Duplicate (EI)
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an IFpUG Function point Case Study
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Browse Employee (EO) Security Login (EQ) Employee ILF Weekly Report (EQ)
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Figure 19-1 Sample new development functional user requirements using IFPUG 43 functional size measurement method
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Enhancement Case Study
For this example we will establish the functional size for the enhancement of a piece of software For this case study we have chosen the enhancement of the Employee Records Management system used in the first example
Sample Set of User Requirements
The following list represents a sample set of user requirements for the enhancement of the newly developed software described previously: 1 The add new employee function will now include additional logic steps to validate fields that were not validated in the first release of the software 2 The scheduled weekly report will now include a calculated value that sums the total number of employees listed 3 The software application will now include a navigational menu for users to select the data maintenance function they wish to perform on the employee data
No other changes will be made
Functional User Requirements
Functional size represents the size of the subset of user requirements known as the functional user requirements (that is, what functions the software must support), which excludes quality and technical requirements Of the listing of user requirements, 1 and 2 represent the functional user requirements, while 3 is a nonfunctional requirement to provide end-user friendliness (navigational aids) Therefore, only the first two requirements will be included in the determination of functional size
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